The first entry is always the pin's source. Overall confidence is a weighted average of how firmly each reference supports the start and end times used above; a reference counts half as much for every 180 days older than the newest.
AWS's own anniversary post and a dated 14 March 2006 press release give March 14, 2006 as the S3 launch.
Contemporary report with the per-gigabyte storage and transfer rates.[1]
Launch-day trade press coverage.[1]
Independent trade coverage of the launch.[1]
Something missing or wrong? Say it in your own words: a link that backs this pin up, a different start or end date and why, or a fact it lacks or gets wrong. The AI checks it against this pin's sources, searches for better ones, and adds any page that backs you up. The pin's own sources still count most. A picture that shows something else, or shows it badly, is looked at too, and moved down or replaced.